package com.final_;

public class FinalExercise01 {
    public static void main(String[] args) {
        double v = new Cal().calCircle(23);
        System.out.println(v);
    }
}

class Cal{
    public final double pi = 3.14;
//    private double radius;
    public double calCircle(double radius){
        return pi*radius*radius;
    }
}
